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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce4b52498a74ec8e8de8e82366f7a267a34eaba1a9473a0d79568a17bdad8e17' 
  AND token = 'IN/6eOPh5akIaI0TN3LFqpmOyMZjTqX2X6nFKJZSELY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}